Safety pulley



1,640,624 A. G. STEINMAYER- 4 SAFETY PULLEY 4 Fi led Feb 15, 1926 2 Sheets-Sheet 1 3o v 1640624 A 1927 A. ca. STEINMAYER SAFETY PULLEY Filed Feb. 15 1926 2 Sheets-Sheet 2 A1W1n Ejtammaym:

Patented Aug. 30, 1927.

tJNtT-ED STATES sateen ALWIfi G. STEINMAYER, OF MILWAUKEE; VIISGO'NSIN, ASSIGNOR TO LINE MATERIAL GOIIIPANYQOF SOUTH MILWAUKEE, W'ISOOHSIEI, ACDRPORATIQN WISCONSIN;

SAFETY PULLEY.

Application filed February 15, 1926. Serial No. 88,467.

' his invention relates to certain new anduseful improvements in sarety pulleys employed in connection with street lighting fixtures, more particularly hat type known in the art as the two-way and tour-way holovphane retractor.

Heretotore the safety or one-way pulleys tor the suspension of street lighting fixtures have not been used in connection with the two and founway retra'ctors, in that the safety pulleys now inuse allow the retractoror fixtureto rotate. It is of prime importancethat a retractor ot the two or tourwaytype be restrained against rotation'while suspended and that it be returned to its proper position each time. an object of this invention to provide a safety pulley having means for returning the fixture to its proper position with respect to the roadwa after each operation. I

Another object of this invention resides in the provisionot a satetypulley having means cooperating with the fixture for align- 111 the same in a predetermined relation with the pulley upon engagement ot its carrying means therewith.

A further object of this invention resides in the provision of a suspension means of the class described consisting of a stationary and a movable part having cooperating means for aligning a fixture carried by the 'movable part in a predetermined relation with the fixed part during the engagement of tionary part therewith and restraining the same against rotation atter-its'engagement with the stationary part. I

-And a still further ob ect of this inventionresides in the provision of a device of the character described which is positive in.

its action, of simple construction and has ample protection agalnst the elements.

Figure 1' is a perspective view ot'a street or roadway intersection equipped -.with a lighting. fixture having a four-way holophane refractor, said view "diagrammatically illustrating the directional qualities of the light rays; V

Figure 2 is a view in side elevation of a safety pulley and fixture embodying my in vention, parts thereof being in section to more clearly illustrate constructional details thereof, and

Figure 3 is a cross sectional view taken on the plane of the line 3-3 of Figure 2.

Referring now more particularly to the Therefore, it is the staaccompanying drawings, in which like nuinerals designate like parts throughout the several VIEWS; the numeralh designates a street or roadway intersection at diagonal corners of which two poles 6 and 7 are mounted. The pole 7 may support the usual. line wires, one of which forms the supply line' tor the lighting fixture 8 suspended from the center span wire 9 connecting the poles substantially as shown and the arrows 1O illustrate the direction of the concentrated rays of a fixture of this type.

A pulley block housing 11 is suspended;v

from the span wire 9 by a clamping mem berlQ which has .its channel (not. shown) through which the wire passes curved to guard against creeping of themember '12 therealong.

r The housing 11 forms substantially an enclosure being open only at its bottom and having a small opening at the top to allow an operating cable or rope 13 to be passed througln The housing comprises two complementary side wallsle between which a pulley 15 is journaled, as at 16, at its upper end portion, and two-end walls 14, one of which terminates short of the other to incline the housing bottom as illustrated.

Thefixture 8 has athreaded bore 17 in its top surface intowhich the threaded stud 17" of a tubular rope securing member '18 is secured, the bore of said member teri hating in an annular channel or recess formed in an enlarged portion 18 having its outer wall notched as at 19. The rope 13 has one end passed through the bore of member '18, around 111 the annular channel of the en-.

largement l8 and out of the groove or opening 19, being anchored at this point by a flange member 20 drawn down tight by a nut i threaded onto a screw 21. The other end ot the rope is brought up through the elongated opening in the bottom of the housing over the pulley. out through thesmall openingat the top of the housing, overa pulley 22 secured to pole '6 and then down along the pole to be ,removably securedthertetqas at 23.

The upper end of the member 16 has a knob 24 formed thereon which cooperates with guides 25 formed on the inner surfaces of the housing side walls. The-walls 13 are spaced a distance substantially equal to the diameter of the knob whereas the distance between the opposite guides 25 is less, being substantially equal to the diameter of the member 16. The guides are so arranged as to form an entrance 26, an approximately V-shaped rest 27, an ex t 28 and passageways and conneeting the same. In the normal or operative position of the fixture,

the knob 24 is supported by the rest 27 and when it is desired to lower the fixture, the rope is drawn up causing the knob to travel up through the passageway 29 and into the passage-way 30. Releasing the tension on the rope allows the knob to pass through the passage-way 30 and out through the exit 28. Y

In returning the fixture to its operative position, the rope is drawn up until the knob contacts with the guides 25 on the lower or bottom portion of the housing and defining one side oi"- the rest 27 and travels therealong untilrit reaches the entrance 26 nndswings thereinto. The tension on the rope is then released and the knob moves into the rest 2?. V

The point of suspension of the housing 11 v is so placed with respect to the distributed weight thereof that it hangs by gravity in a position with the entrance'26 to one side and the throat ofpassage 30 and exit 28011 the other side of the true plumb axis of the rope 13.

In entering, the member; 18 is swung to one side of its true vertical position by engagement of the knob with the lower, outer guides 25 until the knob 23! reaches the entrance 26 where it is free to swing by gravity into its true vertical position, at which point it is aligned with the passage into the rest 27. Releasing the tension of the rope allows the knob to seat itself on the rest 27 and secure the fixture in operative position.

As above described, to lower the fixture, tension is applied to the rope whereupon the knob 24 enters the throat of passage-way 29, the entrance to which is inline with the true vertical axis of the rope and continued upward movement of the knob causes the member 18 to ride to one side oi its plumb I axis until it reaches the throat of passage 30. Here again member 18 is free to swing back into its plumb position registering with the entrance to the passage 30 and when the tension on therope is released the knob is guided down through the passage 30 and out the exit 28. The exit 28 is offseta relatively large distance with respect to the true plumb ofth'e fixture to guard against any possibility of the knob entering atthe exit.

In order to insure that the rays of light be always in the same direction, it is necessary that the knob enter the housingalways in the same manner. To a o'complish jtlii's the upper end'of the member 16'is provided with a laterally projected boss 31 of the same thickness as the diameter of the barrel of member 16, thereby enabling the boss to pass between the opposite guides 25, but restraining all rotation of the member 16. It will be obvious that this projection'serves as a simplefmeans forinsuring the return or the fixture to its proper position with the light rays in the desired directions, and does knob.

is shown in Figure 2 of the drawings, it is' possible'that it be twisted lSOdegre'es, and enters'the housing in that manner. Thisfis not objectionable as it will in no. way affect thedirectional qualities oftherefractor.

What I claim as my invention is:' v v i -.1. In a device of the class described, a housing having openings therein, guides formed on the inside walls of the'housing and cooperating with the openingsto form an entrancea nd an exit, a pulley mounted in the housing, a flexible member trained thereover, a fixture vcarrying ni'emb'er secured to one end otthe flexible member, an annular enlargement on the fixture carrying member adapted to, when drawn up by the flexible member, engage the guides, and a lateral projection on the fixture carrying member for aligningthe fixture in a predetermined relation-with the housing. 7

2. In a device of the, class described, the combination witha lighting fixture having directional qualities, of a suspension meniher, a guide mounted therein, a flexible member trained about the guide, a fixture carrying membernon-rotatably fixed to the fixture and suspended by the flexible memher, an extension on the fixture carrying member with which the flexible member is connected, a globular enlargement on the extension and adapted 'to engage the suspension member to supportthefixturej-thera tronnand a lateral extension'on the extension and having .a thickness equal to the diameteif of the extension, whereby rotation of the fixture with respect to thesuspension member is restrained, V

In testimony; whereof I afiix signature;

Besides the position in which the fixture 

